(Newser)
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Robin Williams was back to being funny yesterday, appearing on the Late Show more than two months after the heart surgery that halted his tour, E! reports. “I have a cow valve, which is great, and the grazing’s been fun," he told David Letterman, a veteran of quintuple bypass surgery. "And I give a good quart of cream, too.” The Weapons of Self Destruction tour will resume in September.

Williams said he found himself having trouble breathing on the tour. "I realize now, shortness of breath is kind of code for heart problem, just like exhaustion is code for alcoholic," he joked. He also expressed gratitude to his doctors. “You do get a second lease on life, and it’s a gift, you know, thank you. And thank all of you. It’s, like, a great thing.”